Potential of Thermal Energy Storage for a District Heating System Utilizing Industrial Waste Heat

Hanne Kauko, Daniel Rohde, Brage Rugstad Knudsen and Terje Sund-Olsen
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Hanne Kauko: SINTEF Energy Research, Sem Sælands vei 11, 7034 Trondheim, Norway
Daniel Rohde: SINTEF Energy Research, Sem Sælands vei 11, 7034 Trondheim, Norway
Brage Rugstad Knudsen: SINTEF Energy Research, Sem Sælands vei 11, 7034 Trondheim, Norway
Terje Sund-Olsen: Mo Fjernvarme AS, Halvor Heyerdahls vei 48, 8626 Mo i Rana, Norway

Energies, 2020, vol. 13, issue 15, 1-12

Abstract: The potential for utilizing industrial waste heat for district heating is enormous. There is, however, often a temporal mismatch between the waste heat availability and the heating demand, and typically fossil-based peak boilers are used to cover the remaining heat demand. This study investigates the potential of applying a thermal energy storage tank at the district heating supply system at Mo Industrial Park in Norway, where waste heat from the off-gas of a ferrosilicon production plant is the main heating source. To cover peak heating demands, boilers based on CO gas, electricity, and oil are applied. The reduction in peak heating costs and emissions is evaluated as a function of tank size for two different scenarios: (1) a scenario where CO gas, which is a byproduct from another nearby industry, is the main peak heating source; and (2) a scenario where no CO gas is available, and electricity is the main peak heating source. The highest economic viability is obtained with the smallest storage tank with a volume of 1000 m 3 , yielding a payback period of 7.1/16.2 years and a reduction in total heat production costs of 14.6/10.0% for Scenarios 1/2, respectively. The reduction in CO 2 emissions is 19.4/14.8%, equal to 820/32 ton CO 2 for the analyzed period. Sensitivity analysis shows a significant reduction in payback period for Scenario 2 with increasing electricity prices, while the payback period in Scenario 1 is most sensitive to the emission factors.

Keywords: district heating; thermal energy storage; industrial waste heat recovery (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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